fix logging.Formatter is old-style class in python 2.6
fix logging.Formatter is old-style class in python 2.6

zhaochunqi/simiki,tankywoo/simiki,zhaochunqi/simiki,9p0le/simiki,zhaochunqi/simiki,tankywoo/simiki,9p0le/simiki,9p0le/simiki,tankywoo/simiki